Sculpt Symmetrize: Fix missing updates with modifiers

source/blender/editors/sculpt_paint/sculpt.c

@@ -1264,6 +1264,7 @@ static bool sculpt_tool_is_proxy_used(const char sculpt_tool)
               SCULPT_TOOL_CLOTH,
               SCULPT_TOOL_PAINT,
               SCULPT_TOOL_SMEAR,
+              SCULPT_TOOL_SYMMETRIZE,
               SCULPT_TOOL_DRAW_FACE_SETS);
 }
 

source/blender/editors/sculpt_paint/sculpt_symmetrize.c

@@ -89,7 +89,8 @@ static int mirrtopo_vert_sort(const void *v1, const void *v2)
 void SCULPT_symmetrize_map_ensure(Object *ob)
 { 
   SculptSession *ss = ob->sculpt;
-  Mesh *me = BKE_mesh_from_object(ob);
+  Mesh *me = BKE_object_get_original_mesh(ob);
+  
 
   if (ss->vertex_info.symmetrize_map) {
       /* Nothing to do. */